Perl releases will be now every year and updates during year will be containing mainly bug fixes. The release 5.14.0 should be stable release, but 5.14.1 should contain bugfixes for issues introduced in 5.14.0.

* Unicode 6.0 support, along with many, many improvements to our Unicode-related features
* Improved support for IPv6
* Significantly easier autoconfiguration of the CPAN client
* A new /r flag which makes s/// substitutions non-destructive
* New regular expression flags to control whether matched strings should be treated as ASCII or Unicode
* New "package Foo { }" syntax
* Uses less memory and CPU than previous releases
* A swathe of bug fixes, a large number associated with the work of Dave Mitchell (http://news.perlfoundation.org/2011/05/fixing-perl5-core-bugs-report-11.html) who has been fixing some deep bugs thanks to a TPF grant;

Perl 5.14.x features numerous new features, optimizations and bugfixes.
You can find a complete list of these changes on the web at: